package com.wsx.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.wsx.common.CustomException;
import com.wsx.dto.SetmealDto;
import com.wsx.entity.Setmeal;
import com.wsx.entity.SetmealDish;
import com.wsx.mapper.SetmealMapper;
import com.wsx.service.SetmealDishService;
import com.wsx.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;

@Slf4j
@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishService setmealDishService;

    /**
     * 新增套餐，同时需要保存套餐和菜品的关联关系
     */
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal，执行insert操作
        /*this.save(setmealDto);*/
        setmealMapper.insert(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream()
                     .map(new Function<SetmealDish, Object>() {
                         @Override
                         public Object apply(SetmealDish setmealDish) {
                             Long id = setmealDto.getId();
                             setmealDish.setSetmealId(id);
                             return setmealDish;
                         }
                     }).collect(Collectors.toList());

        //保存套餐和菜品的关联信息，操作setmeal_dish,执行insert操作
        setmealDishService.saveBatch(setmealDishes);
    }

    /**
     * 根据id查询套餐信息和套餐的菜品信息
     */
    @Override

    public SetmealDto getByIdWithDish(Long id) {
        //根据套餐id获取套餐信息
        Setmeal setmeal = this.getById(id);

        //封装套餐信息到SetmealDto中
        SetmealDto setmealDto = new SetmealDto();
        BeanUtils.copyProperties(setmeal,setmealDto);

        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId,setmeal.getId());
        List<SetmealDish> setmealDishList = setmealDishService.list(queryWrapper);

        setmealDto.setSetmealDishes(setmealDishList);
        return setmealDto;
    }

    /**
     * 修改套餐
     */
    @Override
    @Transactional
    public void updateWithDish(SetmealDto setmealDto) {
        //更新setmeal表基本信息
        this.updateById(setmealDto);

        //更新setmeal_dish表信息delete操作
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId, setmealDto.getId());
        setmealDishService.remove(queryWrapper);

        //更新setmeal_dish表信息insert操作
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        List<SetmealDish> collect = setmealDishes.stream()
                .map(new Function<SetmealDish, SetmealDish>() {
                    @Override
                    public SetmealDish apply(SetmealDish setmealDish) {
                        setmealDish.setSetmealId(setmealDto.getId());
                        return setmealDish;
                    }
                }).collect(Collectors.toList());

        setmealDishService.saveBatch(collect);
    }

    /**
     * 删除套餐，同时需要删除套餐和菜品的关联数据
     */
    @Transactional
    public void removeWithDish(List<Long> ids) {
        //select count(*) from setmeal where id in (1,2,3) and status = 1
        //查询套餐状态，确定是否可用删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper();
        queryWrapper.in(Setmeal::getId,ids);
        queryWrapper.eq(Setmeal::getStatus,1);

        int count = this.count(queryWrapper);
        if(count > 0){
            //如果不能删除，抛出一个业务异常
            throw new CustomException("套餐正在售卖中，不能删除");
        }

        //如果可以删除，先删除套餐表中的数据---setmeal
        this.removeByIds(ids);

        //delete from setmeal_dish where setmeal_id in (1,2,3)
        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);
        //删除关系表中的数据----setmeal_dish
        setmealDishService.remove(lambdaQueryWrapper);
    }
}